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000057411 1001_ $$0P:(DE-Juel1)3735$$aEhhalt, D. H.$$b0$$uFZJ
000057411 245__ $$aOn the Use of nonmethane hydrocarbons for the Determination of Age Spectra in the Lower Stratosphere
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000057411 440_0 $$06393$$aJournal of Geophysical Research D: Atmospheres$$v112$$x0148-0227
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000057411 520__ $$aOn 9 April 2001, while approaching the West Coast of the North American continent, flight 20 of the NASA TRACE P campaign penetrated deeply into a stratospheric intrusion. From measurements aboard that flight we derive vertical profiles of nonmethane hydrocarbons (NMHCs) and other short-lived trace gases in the lower stratosphere using Dichlorofluoromethane, CF2Cl2, as the altitude scale. All profiles show an exponential decrease, which permits the description of their vertical distribution by a single parameter, the scale height. These scale heights are shown to be related to the respective lifetimes in a unique fashion. Using the approximation of a 1-D diffusive model with a constant eddy diffusion coefficient, K, and assuming constant lifetimes, we establish an analytical solution for this relation. By fitting this theoretical expression to the experimental data we can estimate K and thus obtain an approximate age spectrum of the form given by Hall and Plumb (1994). A much better fit to the experimental scale heights is obtained, when we allow the lifetimes to be height-dependent and calculate the theoretical scale heights numerically from a 1-D model. An optimization also suggests a constant K, but with a value of 0.46 m(2)/s, larger than those obtained from the fit of the analytical solution. The obtained age spectra should be valid for transit times not longer than 300 days.
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000057411 7001_ $$0P:(DE-Juel1)16347$$aRohrer, F.$$b1$$uFZJ
000057411 7001_ $$0P:(DE-HGF)0$$aBlake, D. R.$$b2
000057411 7001_ $$0P:(DE-HGF)0$$aKinnison, D. E.$$b3
000057411 7001_ $$0P:(DE-Juel1)129130$$aKonopka, P.$$b4$$uFZJ
000057411 773__ $$0PERI:(DE-600)2016800-7 $$a10.1029/2006JD007686$$gVol. 112, p. D11208$$pD11208$$q112<D11208$$tJournal of geophysical research / Atmospheres  $$tJournal of Geophysical Research$$v112$$x0148-0227$$y2007
000057411 8567_ $$uhttp://dx.doi.org/10.1029/2006JD007686
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